package cn.base.day08;

public class Test10 {
    public static void main(String[] args) {
        StringBuilder s1 = new StringBuilder();
        String s = "";
        long start = System.currentTimeMillis();
        for (int i = 0; i < 20000; i++) {
            s1.append("abc");
        }
        long end = System.currentTimeMillis();
        System.out.println(end - start);
        System.out.println(s);
    }
}
